terraform/builtin/provisioners/chef/resource_provisioner.go

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package chef
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"log"
"os"
"path"
"regexp"
"strings"
"text/template"
"time"
"github.com/hashicorp/terraform/communicator"
"github.com/hashicorp/terraform/communicator/remote"
"github.com/hashicorp/terraform/terraform"
"github.com/mitchellh/go-homedir"
"github.com/mitchellh/go-linereader"
"github.com/mitchellh/mapstructure"
)
const (
clienrb = "client.rb"
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defaultEnv = "_default"
firstBoot = "first-boot.json"
logfileDir = "logfiles"
linuxChefCmd = "chef-client"
linuxConfDir = "/etc/chef"
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secretKey = "encrypted_data_bag_secret"
validationKey = "validation.pem"
windowsChefCmd = "cmd /c chef-client"
windowsConfDir = "C:/chef"
)
const clientConf = `
log_location STDOUT
chef_server_url "{{ .ServerURL }}"
validation_client_name "{{ .ValidationClientName }}"
node_name "{{ .NodeName }}"
{{ if .HTTPProxy }}
http_proxy "{{ .HTTPProxy }}"
ENV['http_proxy'] = "{{ .HTTPProxy }}"
ENV['HTTP_PROXY'] = "{{ .HTTPProxy }}"
{{ end }}
{{ if .HTTPSProxy }}
https_proxy "{{ .HTTPSProxy }}"
ENV['https_proxy'] = "{{ .HTTPSProxy }}"
ENV['HTTPS_PROXY'] = "{{ .HTTPSProxy }}"
{{ end }}
{{ if .NOProxy }}no_proxy "{{ join .NOProxy "," }}"{{ end }}
{{ if .SSLVerifyMode }}ssl_verify_mode {{ .SSLVerifyMode }}{{ end }}
`
// Provisioner represents a specificly configured chef provisioner
type Provisioner struct {
Attributes interface{} `mapstructure:"attributes"`
Environment string `mapstructure:"environment"`
LogToFile bool `mapstructure:"log_to_file"`
HTTPProxy string `mapstructure:"http_proxy"`
HTTPSProxy string `mapstructure:"https_proxy"`
NOProxy []string `mapstructure:"no_proxy"`
NodeName string `mapstructure:"node_name"`
OhaiHints []string `mapstructure:"ohai_hints"`
OSType string `mapstructure:"os_type"`
PreventSudo bool `mapstructure:"prevent_sudo"`
RunList []string `mapstructure:"run_list"`
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SecretKeyPath string `mapstructure:"secret_key_path"`
ServerURL string `mapstructure:"server_url"`
SkipInstall bool `mapstructure:"skip_install"`
SSLVerifyMode string `mapstructure:"ssl_verify_mode"`
ValidationClientName string `mapstructure:"validation_client_name"`
ValidationKeyPath string `mapstructure:"validation_key_path"`
Version string `mapstructure:"version"`
installChefClient func(terraform.UIOutput, communicator.Communicator) error
createConfigFiles func(terraform.UIOutput, communicator.Communicator) error
runChefClient func(terraform.UIOutput, communicator.Communicator) error
useSudo bool
}
// ResourceProvisioner represents a generic chef provisioner
type ResourceProvisioner struct{}
// Apply executes the file provisioner
func (r *ResourceProvisioner) Apply(
o terraform.UIOutput,
s *terraform.InstanceState,
c *terraform.ResourceConfig) error {
// Decode the raw config for this provisioner
p, err := r.decodeConfig(c)
if err != nil {
return err
}
if p.OSType == "" {
switch s.Ephemeral.ConnInfo["type"] {
case "ssh", "": // The default connection type is ssh, so if the type is empty assume ssh
p.OSType = "linux"
case "winrm":
p.OSType = "windows"
default:
return fmt.Errorf("Unsupported connection type: %s", s.Ephemeral.ConnInfo["type"])
}
}
// Set some values based on the targeted OS
switch p.OSType {
case "linux":
p.installChefClient = p.linuxInstallChefClient
p.createConfigFiles = p.linuxCreateConfigFiles
p.runChefClient = p.runChefClientFunc(linuxChefCmd, linuxConfDir)
p.useSudo = !p.PreventSudo && s.Ephemeral.ConnInfo["user"] != "root"
case "windows":
p.installChefClient = p.windowsInstallChefClient
p.createConfigFiles = p.windowsCreateConfigFiles
p.runChefClient = p.runChefClientFunc(windowsChefCmd, windowsConfDir)
p.useSudo = false
default:
return fmt.Errorf("Unsupported os type: %s", p.OSType)
}
// Get a new communicator
comm, err := communicator.New(s)
if err != nil {
return err
}
// Wait and retry until we establish the connection
err = retryFunc(comm.Timeout(), func() error {
err := comm.Connect(o)
return err
})
if err != nil {
return err
}
defer comm.Disconnect()
if !p.SkipInstall {
if err := p.installChefClient(o, comm); err != nil {
return err
}
}
o.Output("Creating configuration files...")
if err := p.createConfigFiles(o, comm); err != nil {
return err
}
o.Output("Starting initial Chef-Client run...")
if err := p.runChefClient(o, comm); err != nil {
return err
}
return nil
}
// Validate checks if the required arguments are configured
func (r *ResourceProvisioner) Validate(c *terraform.ResourceConfig) (ws []string, es []error) {
p, err := r.decodeConfig(c)
if err != nil {
es = append(es, err)
return ws, es
}
if p.NodeName == "" {
es = append(es, fmt.Errorf("Key not found: node_name"))
}
if p.RunList == nil {
es = append(es, fmt.Errorf("Key not found: run_list"))
}
if p.ServerURL == "" {
es = append(es, fmt.Errorf("Key not found: server_url"))
}
if p.ValidationClientName == "" {
es = append(es, fmt.Errorf("Key not found: validation_client_name"))
}
if p.ValidationKeyPath == "" {
es = append(es, fmt.Errorf("Key not found: validation_key_path"))
}
return ws, es
}
func (r *ResourceProvisioner) decodeConfig(c *terraform.ResourceConfig) (*Provisioner, error) {
p := new(Provisioner)
decConf := &mapstructure.DecoderConfig{
ErrorUnused: true,
WeaklyTypedInput: true,
Result: p,
}
dec, err := mapstructure.NewDecoder(decConf)
if err != nil {
return nil, err
}
// We need to merge both configs into a single map first. Order is
// important as we need to make sure interpolated values are used
// over raw values. This makes sure that all values are there even
// if some still need to be interpolated later on. Without this
// the validation will fail when using a variable for a required
// parameter (the node_name for example).
m := make(map[string]interface{})
for k, v := range c.Raw {
m[k] = v
}
for k, v := range c.Config {
m[k] = v
}
if err := dec.Decode(m); err != nil {
return nil, err
}
if p.Environment == "" {
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p.Environment = defaultEnv
}
for i, hint := range p.OhaiHints {
hintPath, err := homedir.Expand(hint)
if err != nil {
return nil, fmt.Errorf("Error expanding the path %s: %v", hint, err)
}
p.OhaiHints[i] = hintPath
}
if p.ValidationKeyPath != "" {
keyPath, err := homedir.Expand(p.ValidationKeyPath)
if err != nil {
return nil, fmt.Errorf("Error expanding the validation key path: %v", err)
}
p.ValidationKeyPath = keyPath
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}
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if p.SecretKeyPath != "" {
keyPath, err := homedir.Expand(p.SecretKeyPath)
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if err != nil {
return nil, fmt.Errorf("Error expanding the secret key path: %v", err)
}
p.SecretKeyPath = keyPath
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}
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if attrs, ok := c.Config["attributes"]; ok {
p.Attributes, err = rawToJSON(attrs)
if err != nil {
return nil, fmt.Errorf("Error parsing the attributes: %v", err)
}
}
return p, nil
}
func rawToJSON(raw interface{}) (interface{}, error) {
switch s := raw.(type) {
case []map[string]interface{}:
if len(s) != 1 {
return nil, errors.New("unexpected input while parsing raw config to JSON")
}
var err error
for k, v := range s[0] {
s[0][k], err = rawToJSON(v)
if err != nil {
return nil, err
}
}
return s[0], nil
default:
return raw, nil
}
}
// retryFunc is used to retry a function for a given duration
func retryFunc(timeout time.Duration, f func() error) error {
finish := time.After(timeout)
for {
err := f()
if err == nil {
return nil
}
log.Printf("Retryable error: %v", err)
select {
case <-finish:
return err
case <-time.After(3 * time.Second):
}
}
}
func (p *Provisioner) runChefClientFunc(
chefCmd string,
confDir string) func(terraform.UIOutput, communicator.Communicator) error {
return func(o terraform.UIOutput, comm communicator.Communicator) error {
fb := path.Join(confDir, firstBoot)
cmd := fmt.Sprintf("%s -j %q -E %q", chefCmd, fb, p.Environment)
if p.LogToFile {
if err := os.MkdirAll(logfileDir, 0755); err != nil {
return fmt.Errorf("Error creating logfile directory %s: %v", logfileDir, err)
}
logFile := path.Join(logfileDir, p.NodeName)
f, err := os.Create(path.Join(logFile))
if err != nil {
return fmt.Errorf("Error creating logfile %s: %v", logFile, err)
}
f.Close()
o.Output("Writing Chef Client output to " + logFile)
o = p
}
return p.runCommand(o, comm, cmd)
}
}
// Output implementation of terraform.UIOutput interface
func (p *Provisioner) Output(output string) {
logFile := path.Join(logfileDir, p.NodeName)
f, err := os.OpenFile(logFile, os.O_APPEND|os.O_WRONLY, 0666)
if err != nil {
log.Printf("Error creating logfile %s: %v", logFile, err)
return
}
defer f.Close()
// These steps are needed to remove any ANSI escape codes used to colorize
// the output and to make sure we have proper line endings before writing
// the string to the logfile.
re := regexp.MustCompile(`\x1b\[[0-9;]+m`)
output = re.ReplaceAllString(output, "")
output = strings.Replace(output, "\r", "\n", -1)
if _, err := f.WriteString(output); err != nil {
log.Printf("Error writing output to logfile %s: %v", logFile, err)
}
if err := f.Sync(); err != nil {
log.Printf("Error saving logfile %s to disk: %v", logFile, err)
}
}
func (p *Provisioner) deployConfigFiles(
o terraform.UIOutput,
comm communicator.Communicator,
confDir string) error {
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// Open the validation key file
f, err := os.Open(p.ValidationKeyPath)
if err != nil {
return err
}
defer f.Close()
// Copy the validation key to the new instance
if err := comm.Upload(path.Join(confDir, validationKey), f); err != nil {
return fmt.Errorf("Uploading %s failed: %v", validationKey, err)
}
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if p.SecretKeyPath != "" {
// Open the secret key file
s, err := os.Open(p.SecretKeyPath)
if err != nil {
return err
}
defer s.Close()
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// Copy the secret key to the new instance
if err := comm.Upload(path.Join(confDir, secretKey), s); err != nil {
return fmt.Errorf("Uploading %s failed: %v", secretKey, err)
}
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}
// Make strings.Join available for use within the template
funcMap := template.FuncMap{
"join": strings.Join,
}
// Create a new template and parse the client config into it
t := template.Must(template.New(clienrb).Funcs(funcMap).Parse(clientConf))
var buf bytes.Buffer
err = t.Execute(&buf, p)
if err != nil {
return fmt.Errorf("Error executing %s template: %s", clienrb, err)
}
// Copy the client config to the new instance
if err := comm.Upload(path.Join(confDir, clienrb), &buf); err != nil {
return fmt.Errorf("Uploading %s failed: %v", clienrb, err)
}
// Create a map with first boot settings
fb := make(map[string]interface{})
if p.Attributes != nil {
fb = p.Attributes.(map[string]interface{})
}
// Check if the run_list was also in the attributes and if so log a warning
// that it will be overwritten with the value of the run_list argument.
if _, found := fb["run_list"]; found {
log.Printf("[WARNING] Found a 'run_list' specified in the configured attributes! " +
"This value will be overwritten by the value of the `run_list` argument!")
}
// Add the initial runlist to the first boot settings
fb["run_list"] = p.RunList
// Marshal the first boot settings to JSON
d, err := json.Marshal(fb)
if err != nil {
return fmt.Errorf("Failed to create %s data: %s", firstBoot, err)
}
// Copy the first-boot.json to the new instance
if err := comm.Upload(path.Join(confDir, firstBoot), bytes.NewReader(d)); err != nil {
return fmt.Errorf("Uploading %s failed: %v", firstBoot, err)
}
return nil
}
func (p *Provisioner) deployOhaiHints(
o terraform.UIOutput,
comm communicator.Communicator,
hintDir string) error {
for _, hint := range p.OhaiHints {
// Open the hint file
f, err := os.Open(hint)
if err != nil {
return err
}
defer f.Close()
// Copy the hint to the new instance
if err := comm.Upload(path.Join(hintDir, path.Base(hint)), f); err != nil {
return fmt.Errorf("Uploading %s failed: %v", path.Base(hint), err)
}
}
return nil
}
// runCommand is used to run already prepared commands
func (p *Provisioner) runCommand(
o terraform.UIOutput,
comm communicator.Communicator,
command string) error {
var err error
// Unless prevented, prefix the command with sudo
if p.useSudo {
command = "sudo " + command
}
outR, outW := io.Pipe()
errR, errW := io.Pipe()
outDoneCh := make(chan struct{})
errDoneCh := make(chan struct{})
go p.copyOutput(o, outR, outDoneCh)
go p.copyOutput(o, errR, errDoneCh)
cmd := &remote.Cmd{
Command: command,
Stdout: outW,
Stderr: errW,
}
if err := comm.Start(cmd); err != nil {
return fmt.Errorf("Error executing command %q: %v", cmd.Command, err)
}
cmd.Wait()
if cmd.ExitStatus != 0 {
err = fmt.Errorf(
"Command %q exited with non-zero exit status: %d", cmd.Command, cmd.ExitStatus)
}
// Wait for output to clean up
outW.Close()
errW.Close()
<-outDoneCh
<-errDoneCh
// If we have an error, return it out now that we've cleaned up
if err != nil {
return err
}
return nil
}
func (p *Provisioner) copyOutput(o terraform.UIOutput, r io.Reader, doneCh chan<- struct{}) {
defer close(doneCh)
lr := linereader.New(r)
for line := range lr.Ch {
o.Output(line)
}
}